100-3
has been made and which may constitute prima facie evidence of the validity of the copyright and of the facts stated in the certificate, (2) the publication of the Catalogs of Copyright Entries, which provide the basic facts of registration for all registered works, (3) the issuance of certificates certifying that transfers of copyright ownership or other documents pertaining to copyrights have been recorded, (4) the issuance of certified copies of applications, deposit copies, documents, and various other materials submitted to the Copyright Office in connection with registrations and recordations, (5) the maintenance in the Copyright Office of the Copyright Card Catalog, for public use in searching for completed registrations and recorded documents, and (6) the providing of a Copyright Office reference service to furnish, by means of written search reports, the facts of registration and recordation contained in the files of the Office. This system depends, for its reliability and usefulness, primarily upon the examination process.